2-step verification in Gmail makes Anet’s email authentication good enough. But, I would love to see a mobile authenticator like Battle.net or SWTOR’s. Honestly, I don’t see why they didn’t have the option in the first place. It isn’t like these are a new thing. At least two MMOs have used them now, to great effect. I’ve never had a issue with either my Battle.net mobile authenticator or my SWTOR one.
Personally, I’d rather have the mobile authenticator then an on-screen number pad, but anything more secure than email verification is needed!